Bending machine



Aprii 21, 1925.

F. W. BAUMANN BENDING MACHINE Filed Dec. 15. 1923 2 Sheets-Sheet 1 VENTOR F. W. BAUMANN BENDING MACHINE,

Filed Dec. 15',

April 21, 1925.

1923 2 Sheets-Sheet 2 INVENTOR Q w yr /l/fizw Patented Apr. 21, 1925.

UNITED STTE FREDERICK W. BAUMANN, F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO OLIVER, IRON & STEEL CORPORATION, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

BENDING- MACHINE.

To all whom it may concem:

Be it known that I, FnnDnnicK "W. BAU- MANN, a citizen of the United States, and residentof Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in a Bending Machine; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to a machine for bending metal, and more especially to a machine for bending articles so shaped that it is impossible to withdraw the upper die vertically due to the overlapping of portions of the article, which thereby prevents the vertical withdrawal of the upper die.

The object of my invention is to provide a bending machine of this character which is simple and effective in operation, and in which the upper die is withdrawn in such a manner as not to be interfered with by the article formed thereby.

To these ends my invention comprises the novel features hereinafter set forth and claimed:

In the accompanying drawings Figure 1 is a side elevation partly in section of my improved machine; Fig. 2 is a vertical crosssection of the dies, and connections thereto 30 for operating same, showing the position of the metal on the lower die before the bend ing takes place in full lines; Fig. 3 is a like view showing the completion of the article before the withdrawal of the upper die; Fig. 4: is a cross-section broken away at right angles to Fig. 3; and Fig. 5 is a like view showing the upper die withdrawn.

In the drawings the numeral 2 designates a suitable frame or housing in which is journalled the shaft 3 which carries the large gear 4 driven by the pinion 5, which in turn is driven by a suitable motor.

A crank 6 is mounted on the shaft 3 and the stub-shaft 7. The crank-arm 8 is connected to the crank 6 and to the clevis-memher 9. Toggle-arms 10 and 11 are pivotally connected by the pin 12 to the clevis-member 9, said toggle-arms for purposes of adjustment being made in the form of turn-buckles.

In order to retain the toggle-arms 10 and 11 in proper position against lateral movement,

I provide the stay-rod 10 which is connected to the clevis 9, and at its outer end is pivotally mounted on the bracket 10 The upper ends of the toggle-arms 10 and 11 are pivotally connected tothe lugs 13 and 145, respectively, said lugs being connected to the die-holders 15 and 16, respectively. These die-holders have the lugs 17 which are pivotally connected at 18 to the frame.

The die-holders 1.5 and 16 carry the dies 19 and 20, respectively, said d es being held in the holders by screws 21. By this arrangement dies of diiferent shape or size may be used in said die-holders. For making the particular article here illustrated the dies 19 and 20 are L-shaped, the inwardly projecting portions being grooved as at 21" so as to partially enclose the article being formed for the reason hereinafter set forth.

The lower die 22 is carried by the crosshead 23, said cross-head being connected by bolts 24 with the sliding-frame 25 which moves up and down in suitable guides 25 in the housing. The upward movement of the lower die is accomplished by the cams 26 on the shaft 3 and stub-shaft 7, said cams engaging the rollers 27 on the sliding-frame. The cams 26 have the delay faces 28 which provide for holding the lower die in its stationary position during the forming of the article.

The lower die 22 is secured to the crosshead 23 by screw-bolts, so that said lower die may be changed as desired according to the shape of the article to be formed. The lower dies are also grooved as at 30 to hold the article against lateral movement when the upper die is withdrawn, as will more fully hereinafter appear.

The upper die 31 is movable horlzontally, and said upper die is connected to the slidebar 32, said slide-bar having the enlarged portion 33 with a dovetailed seat 34 formed therein to receive said die, which is then secured in place by the key 35. The upper die has the outwardly extending lip portions 36 over which the metal of the article to be formed is bent by the dies 19 and 20, as will more fully hereinafter appear.

The inner end of the slide-bar 32 has the link 37 pivotally connected thereto and to the bell-crank 38 pivotally mounted on the bracket 39 secured to the housing. A link 40 connected to the crank 38 is also connected to the vertical slide-bar 41 moving in suitable guides in the bracket 39. At the lowerend of said slide-bar is the roller 42 which is engaged by the cam 43 on the shaft 3. To provide for the return of the slide bar 32, the spring t-(i is interposed between the frame 2 and an abutmenton the .bar v32, said spring being mounted on the rod d6 upon which said abutment is adapted to slide.

In the operation of the machine in making an anti-creeper tor railroad-rails, ,a pieceoif metal from which the'anti-creeper is to be formed is placed upon the lower die in the position indicated in Fig. 2, whereupon the power is applied to rotate the shaft .3, and the cams 26 raise the slide 25, while at the same time the crank 6 raises the toggle-arms 10 and 11. However, the-cams 26 are so constructed that the lower .die 22 will be advanced to bring the metal 45 into engagement with .the upper. die 31 before the dies 19 and 20 come into-engagement with the upper die, and consequently the metal will be first bent into the shape shown in dotted lines, Fig. 2, with the upwardly extending endportions l6. When the lower die has been raised into this position, the crank 6 has in the meantime been raising the toggle-arms 10 and 11, and the movement of said arms is timed so that the dies 19 and 20 will move inand engage the upward- 1y extending end portions 46 of the metal, and the said dies will act to bend the metal over on to the lip portions 36 of the upper die as indicated in Fig. 3. Owing to. the grooves 21 in dies 19 and 20 and the groove 30 in the lower die 22, the anti-creeper so formed is held against-lateral movement. It is now necessary to withdraw the upper die 31, and this is accomplished by cam' l3 which is so timed that it will new acts to raise the bar a1, and through the bell-crank 38 the bar 32 will be withdrawn to the left, Fig. 1, and the upper die attached thereto will likewise be withdrawn in a horizontal plane, moving out of engagement with the anti-creeper still held in the lower the 22 and the dies 19 and 20. The operations are so timed that as the upper die is withdrawn in this manner, the toggle-arms 10 and 11 are lowered, withdrawing the dies 19 and 20, leaving the anti-creeper resting on the top die, whence it can be readily removed while the top die is lowered to position to receive another blank.

Itwill be understood that the dies may be changed for making many dilterent articles where the ends of the metal are bent inwardly preventmg the vertical withdrawal of the upper die, and that changesand modiand said the for operating the same, a horizontally movable upper die, swinging dies adaptedto bend the metal around said upper die, toggle-arms connected to said lastnamed dies, and a crank-arm on said crank connected to Said toggle-arms.

2. In a metal bending machine, the combination with a suitable frame, of a shaft, a crank on said sl1a;ft,,a vertically movable lower die, connections between said shaft and said lower die for moving the same, a' horizontally movable upper die, swinging dies adapted to bend the metal around said upper die, toggle-arms connected to said last-named dies, a crank-arm on said crank connected to said toggle-arms, a stray-rod connected to said toggle-arms, and ,a :Sta-

tionary support for the outer end of said rod. 2

3. In a bending anachine, the combination'with asuitable frame, of a shaft, a vertically movable lower die, an upper die, dies adapted to bend metal around said upper die, a horizontally movable spring-actuated member carrying said upper die, and connections between said shatt andsald member FREDERICK WV. BAUMANN. 

